Composite Structures Laboratory
 

Projects:

Textile Composites
Size Effects
3-D Compsites
Manufacturing Effects
Blast Response

Fracture/Failure
Adhesive Joints
Reliability Prediction
Thin-Film Laminates
Sandwich Fracture
Cohesive Zone Models

Multi-Scale Theories
Progressive Failure
Cohesive Method
C/SiC Composites

Biological Structures
Insect Wing

Links
University of Michigan
Aerospace Engineering
Lab CTools

 
Cohesive Zone Models and their use in Characterizing Failure Interaction in Laminated Composites
PI: Anthony M. Waas
Particpants:
Pavana Prabhakar, Wei Heok Ng

Computational models of laminates are being developed with the aid of micromechanics models. The latter are used to selectively study important failure modes. One such failure mode is fiber kinking in compression dominated loading. Immediately after kinking, it is frequently observed that adjacent plies undergo delamination. In this project, a methodology is being developed to delineate and understand the various parameters that either favor delaminaton and/or kinking when subjected to compression. In order to accomplish this task, cohesive zone models can be used to advantage. However, when cohesive zone models are used with bi-materials, several questions pertaining to the partition of crack tip energy and how these energies are computed become important. Because of this, we are re-examining some of the pioneering work done by Barenblatt and others in formulating the concepts and ideas that lead to the currently used cohesive zone models in finite element packages.

 
 
    Copyright © 2008 Composite Structures Laboratory | Webmaster: Scott Stapleton